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Quad DC/DC Regulator with Configurable 4A Output Array Powers FPGAs, ASICs & Microprocessors

The LTM4644 is a quad DC/DC step-down µModule regulator with 4A per output. Outputs can be paralleled in an array for up to 16A capability. Included in the package are the switching controllers, power FETs, inductors and support components. Operating over an input voltage range of 4V to 14V with an external bias supply, the LTM4644 supports an output voltage range of 0.6V to 5.5V each set by a single external resistor. Its high efficiency design delivers 4A continuous (5A peak) output current per channel. This device is ideal for applications in military, communications, data storage, industrial, transportation and medical systems.


In conjunction with Arrow Electronics Ltd.

The LTM4644 from Linear Technology is a quad output step-down µModule regulator configurable as a single (16A), dual (12A, 4A or 8A, 8A), triple (8A, 4A, 4A) or quad (4A each) output regulator.

This flexibility enables system designers to rely on one simple and compact µModule regulator for the variety of voltage and load current requirements of FPGAs, ASICs and microprocessors as well as other board circuitry.

The LTM4644 regulator includes the DC/DC controllers, power switches, inductors and compensation components in a 9mm ×15mm × 5.01mm BGA package. Only eight external ceramic capacitors (1206 or smaller case sizes) and four feedback resistors (0603 case size) are required to regulate four independently adjustable outputs between 0.6V to 5.5V.

Separate input pins enable the four channels to be powered from different or a common supply rail(s) from 4V to 14V. The LTM4644 is ideal for applications in military, communications, data storage, industrial, transportation and medical systems.

At an ambient temperature of 55°C, the LTM4644 delivers up to 13A at 1.5V from a 12V input or up to 14A with 200LFM airflow. The four channels operate at 90° out-of-phase to minimize input ripple whether at the 1MHz default switching frequency or synchronized to an external clock between 700kHz and 1.3MHz.

With the addition of an external bias supply above 4V, the LTM4644 can regulate from an input supply voltage as low as 2.375V. Output overvoltage and overcurrent fault protection are included in the regulator as well as overtemperature protection.

The LTM4644 is available with operation specified over the -40°C to +125°C internal temperature range. The µModule regulator is available for immediate delivery from stock with pricing starting at $22.85 each for 1,000-piece quantities.

For more information, visit www.linear.com/product/LTM4644.

Author
Linear Technology (UK) Limited

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